<template>
  <view v-if="goods_info.goods_name">
    <!-- 轮播图 -->
    <swiper :indicator-dots="true" :autoplay="true" :interval="3000" :duration="1000" circular="true">
      <swiper-item v-for="(item,i) in goods_info.pics" :key="i">
        <image :src="item.pics_big" @click="preview(i)"></image>
      </swiper-item>
    </swiper>
    <!-- 商品信息 -->
    <view class="goods-info-box">
      <!-- 价格 -->
      <view class="price">￥{{goods_info.goods_price}}</view>
      <!-- 信息主体 -->
      <view class="goods-info-body">
        <!-- 商品名称 -->
        <view class="goods-name">{{goods_info.goods_name}}</view>
        <!-- 收藏 -->
        <view class="favi">
          <uni-icons type="star" size="18" color="gray"></uni-icons>
          <text>收藏</text>
        </view>
      </view>
      <!-- 运费 -->
      <view class="yf">快递：免运费</view>
    </view>
    <!-- 商品详情 -->
    <rich-text :nodes="goods_info.goods_introduce" class="goods-detail-container"></rich-text>
    <!-- 底部商品导航 -->
    <view class="goods_nav">
      <uni-goods-nav :fill="true" :options="options" :buttonGroup="buttonGroup" @click="onClick"
        @buttonClick="buttonClick" />
    </view>
  </view>
</template>

<script>
  import {
    mapGetters,
    mapMutations
  } from 'vuex'
  export default {
    computed: {
      ...mapGetters('m_cart', ['total'])
    },
    watch: {
      //使用普通函数形式的定义，在页面首次加载时不会被调用
      // 监听total值的变化，通过第一个形参得到变化后的值
      // total(newVal){
      //找到需要改变info的对象
      //   const findResult=this.options.find(x=>x.text==='购物车')
      //   findResult.info=newVal
      // }

      // 定义 total 侦听器，指向一个配置对象
      total: {
        // handler 属性用来定义侦听器的 function 处理函数
        handler(newVal) {
          const findResult = this.options.find(x => x.text === '购物车')
          if (findResult) {
            findResult.info = newVal
          }
        },
        // immediate 属性用来声明此侦听器，是否在页面初次加载完毕后立即调用
        immediate: true,
      }
    },
    data() {
      return {
        //商品详情对象
        goods_info: {},
        options: [{
          icon: 'shop',
          text: '店铺'
        }, {
          icon: 'cart',
        		text: '购物车',
        		info: 0
        }],
        buttonGroup: [{
            text: '加入购物车',
            backgroundColor: '#ff0000',
            color: '#fff'
          },
          {
            text: '立即购买',
            backgroundColor: '#ffa200',
            color: '#fff'
          }
        ]
      };
    },
    onLoad(options) {
      const goods_id = options.goods_id
      this.getGoodsDetail(goods_id)
    },
    methods: {
      // 把 m_cart 模块中的 addToCart 方法映射到当前页面使用
      ...mapMutations('m_cart', ['addToCart']),

      async getGoodsDetail(id) {
        const {
          data: res
        } = await uni.$http.get('/api/public/v1/goods/detail', {
          goods_id: id
        })
        if (res.meta.status !== 200) return uni.$showMsg()
        // 使用字符串的 replace() 方法，为 img 标签添加行内的 style 样式，从而解决图片底部空白间隙的问题  解决在ios设备上不能正常显示的问题
        res.message.goods_introduce = res.message.goods_introduce.replace(/<img /g, '<img style="display:block;" ')
          .replace(/webp/g, 'jpg')
        this.goods_info = res.message
      },
      //轮播图预览函数
      preview(i) {
        //调用函数预览图片
        uni.previewImage({
          //浏览时，默认显示的图片
          current: i,
          //所有图片的地址
          urls: this.goods_info.pics.map(x => x.pics_big)
        })
      },
      onClick(e) {
        if (e.content.text === "购物车") {
          uni.switchTab({
            url: '/pages/cart/cart'
          })
        }
      },
      buttonClick(e) {
        //判断是否点击的是 加入购物车
        if (e.content.text === "加入购物车") {
          //定义一个商品的信息对象
          const goods = {
            goods_id: this.goods_info.goods_id,
            goods_name: this.goods_info.goods_name,
            goods_price: this.goods_info.goods_price,
            goods_count: 1,
            goods_small_logo: this.goods_info.goods_small_logo,
            goods_state: true //商品的勾选状态
          }
          //通过映射过来的方法，把商品信息添加到cart的vuex中
          this.addToCart(goods)
        }
      }
    }
  }
</script>

<style lang="scss">
  swiper {
    height: 750rpx;

    image {
      width: 100%;
      height: 100%;
    }
  }

  .goods-info-box {
    padding: 10px;
    padding-right: 0;

    .price {
      color: #c00000;
      font-size: 18px;
      margin: 10px 0;
    }

    .goods-info-body {
      display: flex;
      justify-content: space-between;

      .goods-name {
        font-size: 13px;
        padding-right: 10px;
      }

      .favi {
        width: 120px;
        font-size: 12px;
        display: flex;
        flex-direction: column;
        justify-content: center;
        align-items: center;
        border-left: 1px solid #efefef;
        color: gray;
      }
    }

    .yf {
      margin: 10px 0;
      font-size: 12px;
      color: gray;
    }
  }

  .goods-detail-container {
    padding-bottom: 50px;
  }

  .goods_nav {
    width: 100%;
    position: fixed;
    bottom: 0;
    left: 0;
  }
</style>
